US2022360208A1PendingUtilityA1

Motor unit

43
Assignee: GLOBAL MIXED MODE TECHNOLOGY INCPriority: May 6, 2021Filed: May 6, 2021Published: Nov 10, 2022
Est. expiryMay 6, 2041(~14.8 yrs left)· nominal 20-yr term from priority
Inventors:Chien-Lun Chu
H02P 29/025H02P 6/26H02P 29/028H02P 29/0241H02P 29/032
43
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Claims

Abstract

A motor unit comprises a power supply, a diode, a capacitor, and a motor controller, where the motor controller comprises a switch unit and a control unit. The switch circuit includes a first upper-side switch, a first lower-side switch, a second upper-side switch, and a second lower-side switch. The control unit is configured to turn on the first upper-side switch and the second lower-side switch and turn off the first lower-side switch and the second upper-side switch. When an input voltage is less than a first reference voltage, the control unit is configured to turn off the first upper-side switch and the second lower-side switch. The motor controller may be configured to avoid an overvoltage problem.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
         1 . A motor unit comprising:
 a power supply;   a motor controller, comprising a switch circuit and a control unit, wherein the switch circuit comprises a first upper-side switch, a first lower-side switch, a second upper-side switch, and a second lower-side switch;   a diode, coupled to the power supply, wherein the power supply provides an input voltage to the motor controller via the diode; and   a capacitor, coupled to the diode, wherein the control unit is configured to turn on the first upper-side switch and the second lower-side switch and turn off the first lower-side switch and the second upper-side switch, and when the input voltage is less than a first reference voltage, the control unit is configured to turn off the first upper-side switch and the second lower-side switch.   
     
     
         2 . The motor unit of  claim 1 , wherein when the input voltage is less than the first reference voltage, the control unit is further configured to turn off the first lower-side switch and the second upper-side switch. 
     
     
         3 . The motor unit of  claim 1 , wherein the first reference voltage is an undervoltage lockout voltage. 
     
     
         4 . The motor unit of  claim 1 , wherein when the input voltage is greater than the first reference voltage again, the control unit is configured to turn on the first upper-side switch and the second lower-side switch and turn off the first lower-side switch and the second upper-side switch. 
     
     
         5 . The motor unit of  claim 1 , wherein the motor controller enables the input voltage to oscillate nearby the first reference voltage. 
     
     
         6 . The motor unit of  claim 1 , wherein when the input voltage is less than a second reference voltage, the control unit is configured to turn off the first upper-side switch, the first lower-side switch, the second upper-side switch, and the second lower-side switch. 
     
     
         7 . The motor unit of  claim 6 , wherein the second reference voltage is a power on reset voltage. 
     
     
         8 . The motor unit of  claim 6 , wherein the first reference voltage is greater than the second reference voltage. 
     
     
         9 . The motor unit of  claim 1 , wherein when the input voltage is less than a second reference voltage, the motor controller resets a memory unit. 
     
     
         10 . The motor unit of  claim 1 , wherein the motor controller is implemented in an integrated circuit chip, and when the input voltage is less than a second reference voltage, the integrated circuit chip is reset. 
     
     
         11 . The motor unit of  claim 1 , wherein the motor unit is applied to a single-phase or polyphase configuration. 
     
     
         12 . The motor unit of  claim 1 , wherein the motor controller is configured to avoid an overvoltage problem. 
     
     
         13 . A motor controller, wherein the motor controller is configured to drive a motor, the motor has a motor coil, and the motor controller comprising:
 a switch circuit, configured to supply a coil current to the motor coil, wherein the switch circuit comprises a first upper-side switch, a first lower-side switch, a second upper-side switch, and a second lower-side switch; and   a control unit, configured to generate a plurality of control signals to control the switch circuit, wherein the control unit is configured to turn on the first upper-side switch and the second lower-side switch and turn off the first lower-side switch and the second upper-side switch, and when an input voltage is less than a first reference voltage, the control unit is configured to turn off the first upper-side switch and the second lower-side switch.   
     
     
         14 . The motor controller of  claim 13 , wherein when the input voltage is less than the first reference voltage, the control unit is further configured to turn off the first lower-side switch and the second upper-side switch. 
     
     
         15 . The motor controller of  claim 13 , wherein the first reference voltage is an undervoltage lockout voltage. 
     
     
         16 . The motor controller of  claim 13 , wherein when the input voltage is greater than the first reference voltage again, the control unit is configured to turn on the first upper-side switch and the second lower-side switch and turn off the first lower-side switch and the second upper-side switch. 
     
     
         17 . The motor controller of  claim 13 , wherein the motor controller enables the input voltage to oscillate nearby the first reference voltage. 
     
     
         18 . The motor controller of  claim 13 , wherein when the input voltage is less than a second reference voltage, the control unit is configured to turn off the first upper-side switch, the first lower-side switch, the second upper-side switch, and the second lower-side switch. 
     
     
         19 . The motor controller of  claim 18 , wherein the second reference voltage is a power on reset voltage. 
     
     
         20 . The motor controller of  claim 18 , wherein the first reference voltage is greater than the second reference voltage. 
     
     
         21 . The motor controller of  claim 13 , wherein the motor controller further comprises a first comparator and a second comparator, the first comparator compares the input voltage with the first reference voltage, so as to generate a first driving signal to the control unit, and the second comparator compares the input voltage with a second reference voltage, so as to generate a second driving signal to the control unit. 
     
     
         22 . The motor controller of  claim 13 , wherein when the input voltage is less than a second reference voltage, the motor controller resets a memory unit. 
     
     
         23 . The motor controller of  claim 13 , wherein the motor controller is implemented in an integrated circuit chip, and when the input voltage is less than a second reference voltage, the integrated circuit chip is reset. 
     
     
         24 . The motor controller of  claim 13 , wherein the motor controller is applied to a single-phase or polyphase configuration. 
     
     
         25 . The motor controller of  claim 13 , wherein the motor controller is configured to avoid an overvoltage problem.

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